1110.2 - 1

(Adopted August 3, 1990)(Amended September 7, 1990)(Amended August 12, 1994)

(Amended December 9, 1994)(Amended November 14, 1997)

(Amended June 3, 2005)(Amended February 1, 2008)(Amended July 9, 2010)

(Amended September 7, 2012)

RULE 1110.2 EMISSIONS FROM GASEOUS- AND LIQUID-FUELED 

ENGINES

(a) Purpose

The purpose of Rule 1110.2 is to reduce Oxides of Nitrogen (NOx), Volatile 

Organic Compounds (VOCs), and Carbon Monoxide (CO) from engines.

(b) Applicability

All stationary and portable engines over 50 rated brake horsepower (bhp) are 

subject to this rule.

(c) Definitions

For the purpose of this rule, the following definitions shall apply:

(1) AGRICULTURAL STATIONARY ENGINE is a non-portable engine 

used for the growing and harvesting of crops or the raising of fowl or 

animals for the primary purpose of making a profit, providing a livelihood, 

or conducting agricultural research or instruction by an educational 

institution. An engine used for the processing or distribution of crops or 

fowl or animals is not an agricultural engine.

(2) APPROVED EMISSION CONTROL PLAN is a control plan, submitted 

on or before December 31, 1992, and approved by the Executive Officer 

prior to November 14, 1997, that was required by subdivision (d) of this 

rule as amended September 7, 1990.

(3) CERTIFIED SPARK-IGNITION ENGINES mean engines certified by 

California Air Resources Board (CARB) to meet emission standards in 

accordance with Title 13, Chapter 9, Article 4.5 of the California Code of 

Regulations (CCR).

(4) EMERGENCY STANDBY ENGINE is an engine which operates as a 

temporary replacement for primary mechanical or electrical power during 

periods of fuel or energy shortage or while the primary power supply is 

under repair.
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 2

(5) ENGINE is any spark- or compression-ignited internal combustion engine, 

including engines used for control of VOCs, but not including engines 

used for self-propulsion.

(6) EXEMPT COMPOUNDS are defined in District Rule 102 - Definition of 

Terms.

(7) FACILITY means any source or group of sources or other air contaminant 

emitting activities which are located on one or more contiguous properties 

within the District, in actual physical contact or separated solely by a 

public roadway or other public right-of-way, and are owned or operated by 

the same person (or by persons under common control), or an outer 

continental shelf (OCS) source as determined in Section 55.2 of Title 40, 

Part 55 of the Code of Federal Regulations (40 CFR Part 55). Such 

above-described groups, if noncontiguous, but connected only by land 

carrying a pipeline, shall not be considered one facility. Sources or 

installations involved in crude oil and gas production in Southern 

California Coastal or OCS Waters and transport of such crude oil and gas 

in Southern California Coastal or OCS Waters shall be included in the 

same facility which is under the same ownership or use entitlement as the 

crude oil and gas production facility on-shore.

(8) LEAN-BURN ENGINE means an engine that operates with high levels of 

excess air and an exhaust oxygen concentration of greater than 4 percent.

(9) LOCATION means any single site at a building, structure, facility, or 

installation. For the purpose of this definition, a site is a space occupied or 

to be occupied by an engine. For engines which are brought to a facility to 

perform maintenance on equipment at its permanent or ordinary location, 

each maintenance site shall be a separate location.

(10) NET ELECTRICAL ENERGY means the electrical energy produced by a 

generator, less the electrical energy consumed by any auxiliary equipment 

necessary to operate the engine generator and, if applicable, any heat 

recovery equipment, such as heat exchangers.

(11) NON-ROAD ENGINE is any engine, defined under 40 CFR Part 89, that

does not remain or will not remain at a location for more than 12 

consecutive months, or a shorter period of time where such period is 

representative of normal annual source operation at a stationary source 

that resides at a fixed location for more than 12 months (e.g., seasonal 

operations such as canning facilities), and meets one of the following:
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 3

(A) Is used in or on a piece of equipment that is self-propelled or 

serves a dual purpose by both propelling itself and performing 

another function (such as a mobile crane); or

(B) Is used in or on a piece of equipment that is intended to be 

propelled while performing its function (such as lawn mowers and 

string trimmers); or

(C) By itself, or in or on a piece of equipment, is portable or 

transportable, meaning designed to be and capable of being carried 

or moved from one location to another. Transportability includes, 

but is not limited to, wheels, skids, carrying handles, dolly, trailer, 

platform or mounting.

(12) OPERATING CYCLE means a period of time within which a round of 

regularly recurring events is completed, and cannot be stopped without the 

risk of endangering public safety or health, causing material damage to the 

equipment or product, or cannot be stopped due to technical constraints. 

Economic reasons alone will not be sufficient to extend this time period. 

The operating cycle includes batch processes that may start and finish 

several times within a twenty-four hour period, in which case each start to 

finish interval is considered a complete cycle.

(13) OXIDES OF NITROGEN (NOx) means nitric oxide and nitrogen dioxide.

(14) PORTABLE ENGINE is an engine that, by itself or in or on a piece of 

equipment, is designed to be and capable of being carried or moved from 

one location to another. Indications of portability include, but are not 

limited to, wheels, skids, carrying handles, dolly, trailer, platform or 

mounting. The operator must demonstrate the necessity of the engine 

being periodically moved from one location to another because of the 

nature of the operation.

An engine is not portable if:

(A) the engine or its replacement remains or will reside at the same 

location for more than 12 consecutive months. Any engine, such 

as a back-up or stand-by engine, that replaces an engine at a 

location and is intended to perform the same function as the engine 

being replaced, will be included in calculating the consecutive time 

period. In that case, the cumulative time of both engines, including 

the time between the removal of the original engine and 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 4

installation of the replacement engine, will be counted toward the 

consecutive time period; or

(B) the engine remains or will reside at a location for less than 12 

consecutive months where such a period represents the full length 

of normal annual source operations such as a seasonal source; or

(C) the engine is removed from one location for a period and then it or 

its equivalent is returned to the same location thereby 

circumventing the portable engine residence time requirements.

The period during which the engine is maintained at a designated storage 

facility shall be excluded from the residency time determination.

(15) RATED BRAKE HORSEPOWER (bhp) is the rating specified by the 

manufacturer, without regard to any derating, and listed on the engine 

nameplate.

(16) RICH-BURN ENGINE WITH A THREE-WAY CATALYST means an 

engine designed to operate near stoichiometric conditions with a catalytic 

control device that simultaneously reduces emissions of NOx, CO and 

VOC. 

(17) STATIONARY ENGINE is an engine which is either attached to a 

foundation or if not so attached, does not meet the definition of a portable 

or non-road engine and is not a motor vehicle as defined in Section 415 of 

the California Vehicle Code.

(18) TIER 2 AND TIER 3 DIESEL ENGINES mean engines certified by 

CARB to meet Tier 2 or Tier 3 emission standards in accordance with 

Title 13, Chapter 9, Article 4 of the CCR.

(19) USEFUL HEAT RECOVERED means the waste heat recovered from the 

engine exhaust and/or cooling system that is put to productive use. The 

waste heat recovered may be assumed to be 100% useful unless the hot 

water, steam or other medium is vented to the atmosphere, or sent directly 

to a cooling tower or other unproductive use.

(20) VOLATILE ORGANIC COMPOUND (VOC) is as defined in Rule 102.

(d) Requirements

(1) Stationary Engines: 

(A) Operators of stationary engines with an amended Rule 1110.1 

Emission Control Plan submitted by July 1, 1991, or an Approved 

Emission Control Plan, designating the permanent removal of 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 5

engines or the replacement of engines with electric motors, in 

accordance with subparagraph (d)(1)(B), shall do so by 

December 31, 1999, or not operate the engines on or after 

December 31, 1999 in a manner that exceeds the emission 

concentration limits listed in Table I:

TABLE I

ALTERNATIVE TO ELECTRIFICATION 

CONCENTRATION LIMITS

NOx VOC CO

(ppmvd)

1

11

(ppmvd)

2

30

(ppmvd)

1

70

1

Parts per million by volume, corrected to 15% oxygen on a dry 

basis and averaged over 15 minutes.

2

Parts per million by volume, measured as carbon, corrected to 

15% oxygen on a dry basis and averaged over the sampling 

time required by the test method.

(B) The operator of any stationary engine not covered by (d)(1)(A) and

not exempt from this rule shall 

(i) Remove such engine permanently from service or replace 

the engine with an electric motor, or

(ii) Not operate the engine in a manner that exceeds the 

applicable emission concentration limits listed in either 

Table II or Table III-A or B.

TABLE II

CONCENTRATION LIMITS

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

bhp ≥ 500: 36

bhp < 500: 45

250 2000

CONCENTRATION LIMITS

EFFECTIVE JULY 1, 2010

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

bhp ≥ 500: 11

bhp < 500: 45

bhp ≥ 500: 30

bhp < 500: 250

bhp ≥ 500: 250

bhp < 500: 2000
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 6

CONCENTRATION LIMITS

EFFECTIVE JULY 1, 2011

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

11 30 250

1

Parts per million by volume, corrected to 15% oxygen on a 

dry basis and averaged over 15 minutes.

2

Parts per million by volume, measured as carbon, corrected to 

15% oxygen on a dry basis and averaged over the sampling 

time required by the test method.

The concentration limits effective on and after July 1, 2010 shall 

not apply to engines that operate less than 500 hours per year or 

use less than 1 x 109 British Thermal Units (Btus) per year (higher 

heating value) of fuel.

If the operator of a two-stroke engine equipped with an oxidation 

catalyst and insulated exhaust ducts and catalyst housing

demonstrates that the CO and VOC limits effective on and after 

July 1, 2010 are not achievable, then the Executive Officer may, 

with United States Environmental Protection Agency (EPA) 

approval, establish technologically achievable, case-by-case CO 

and VOC limits in place of the concentration limits effective on 

and after July 1, 2010. The case-by-case limits shall not exceed 

250 ppmvd VOC and 2000 ppmvd CO.

If the operator of an engine that uses non-pipeline quality natural 

gas demonstrates that due to the varying heating value of the gas a 

longer averaging time is necessary, the Executive Officer may 

establish for the engine a longer averaging time, not to exceed six 

hours, for any of the concentration limits of Table II. Non-pipeline 

quality natural gas is a gas that does not meet the gas specifications 

of the local gas utility and is not supplied to the local gas utility. 

(C) The operator of any stationary engine fired by landfill or digester 

gas (biogas) shall not operate the engine in a manner that exceeds

the emission concentration limits of Table III-A, provided that the 

facility monthly average biogas usage by the biogas engines is 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 7

90% or more, based on the higher heating value of the fuels used. 

The calculation of the monthly facility biogas use percentage may 

exclude natural gas fired during: any electrical outage at the 

facility; a Stage 2 or higher electrical emergencies called by the 

California Independent System Operator Corporation; and when a 

sewage treatment plant activates an Emergency Operations Center 

or Incident Command System, as part of an emergency response 

plan, because of either high influent flows caused by precipitation 

or a disaster. 

TABLE III-A

CONCENTRATION LIMITS FOR LANDFILL 

AND DIGESTER GAS (BIOGAS)-FIRED ENGINES

NOx (ppmvd)

1 VOC (ppmvd)2 CO (ppmvd)1

bhp ≥ 500: 36 x ECF3

bhp < 500: 45 x ECF3

Landfill Gas: 40

Digester Gas: 250 x ECF3

2000

TABLE III-B

CONCENTRATION LIMITS

EFFECTIVE JANUARY 1, 2016

NOx (ppmvd)1 VOC (ppmvd)2 CO (ppmvd)1

11 30 250

1

Parts per million by volume, corrected to 15% oxygen on a dry 

basis and averaged over 15 minutes.

2

Parts per million by volume, measured as carbon, corrected to 

15% oxygen on a dry basis and averaged over the sampling time 

required by the test method.

3

ECF is the efficiency correction factor.

The ECF shall be 1.0 unless: 

(i) The engine operator has measured the engine’s net specific

energy consumption (qa), in compliance with ASME 

Performance Test Code PTC 17 -1973, at the average load 

of the engine; and

(ii) The ECF-corrected emission limit is made a condition of 

the engine’s permit to operate. 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 8

The ECF is as follows: 

ECF = 9250 Btus/hp-hr

Measured qa in Btus/hp-hr

Measured qa shall be based on the lower heating value of the fuel. 

ECF shall not be less than 1.0.

The Executive Officer may approve the burning of more than 10% 

natural gas in a landfill or digester gas-fired engine, when it is 

necessary, if: the only alternative to limiting natural gas to 10% 

would be shutting down the engine and flaring more landfill or 

digester gas; or the engine requires more natural gas in order for a 

waste heat recovery boiler to provide enough thermal energy to 

operate a sewage treatment plant, and other boilers at the facility 

are unable to provide the necessary thermal energy. 

(D) Notwithstanding the provisions of subparagraph (d)(1)(B), the 

operator of any stationary engine fired by landfill or digester gas

(biogas) shall not operate the engine in a manner that exceeds the 

emission concentration limits of Table III.

(E) Biogas engine operators that establish to the satisfaction of the 

Executive Officer that they have complied with the emissions 

limits of Table III-B by January 1, 2015 will have their respective 

engine permit application fees refunded. 

(F) Once an engine complies with the concentration limits as specified 

in Table III-B, there shall be no limit on the percentage of natural 

gas burned. 

(G) The concentration limits effective as specified in Table III-B shall 

not apply to engines that operate fewer than 500 hours per year or 

use less than 1 x 109 Btus per year (higher heating value) of fuel. 

(H) An operator of a biogas engine may determine compliance with the 

NOx and/or CO limits of Table III-B by utilizing a longer 

averaging time as set forth below, provided the operator 

demonstrates through CEMS data that the engine is achieving a 

concentration at or below 9.9 ppmv for NOx and 225 ppmv for CO 

(if CO is elected for averaging), each corrected to 15% O2, over a 4 

month time period. An operator may utilize a monthly fixed 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 9

interval averaging time for the first 4 months of the retrofitted

engine’s operation and up to a 24 hour fixed interval averaging 

time thereafter. For purposes of determining compliance using a 

longer averaging time: 

(i) An operator shall not average data during one-minute 

periods in which the underlying equipment is not operated 

or when the CEMS is undergoing zero or calibration 

checks, cylinder gas audits, or routine maintenance in 

accordance with the provisions in Rules 218 and 218.1. 

(ii) Notwithstanding the requirements of Rules 218 and 218.1, 

for one-minute time periods where NOx and/or CO CEMS 

data are greater than 95 percent of the Rule 218.1 Full 

Scale Range while the underlying equipment is operating, 

an operator shall use substitute data. A concentration 

equivalent to 3 times the NOx and/or CO emission limits in 

Table III-B (each corrected to 15% O2) shall be used as 

substitute data. 

(iii) The intentional shutdown of a CEMS to circumvent the 

emission limits of Table III-B while the underlying 

equipment is in operation shall constitute a violation of this 

rule. 

(iv) The averaging provisions of this subparagraph shall not 

apply to CEMS that are time shared by multiple biogas 

engines. 

(I) The operator of any new engine subject to subparagraph (e)(1)(B) 

shall: 

(i) Comply with the requirements of Best Available Control 

Technology in accordance with Regulation XIII if the 

engine requires a District permit; or

(ii) Not operate the engine in a manner that exceeds the 

emission concentration limits in Table I if the engine does 

not require a District permit.

(J) By February 1, 2009, the operator of a spark-ignited engine 

without a Rule 218-approved continuous emission monitoring 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 10

system (CEMS) or a Regulation XX (RECLAIM)-approved CEMS 

shall equip and maintain the engine with an air-to-fuel ratio 

controller with an oxygen sensor and feedback control, or other 

equivalent technology approved by the Executive Officer, CARB 

and EPA.

(K) New Non-Emergency Electrical Generators

(i) All new non-emergency engines driving electricalgenerators shall comply with the following emission 

standards:

TABLE IV

EMISSION STANDARDS FOR NEW 

ELECTRICAL GENERATION ENGINES

Pollutant Emission Standard (lbs/MW-hr)1

NOx 0.070

CO 0.20

VOC 0.102

1. The averaging time of the emission standards is 15 

minutes for NOx and CO and the sampling time required 

by the test method for VOC, except as described in the 

following clause.

2. Mass emissions of VOC shall be calculated using a ratio of 

16.04 pounds of VOC per lb-mole of carbon.

(ii) Engines subject to this subparagraph that produce 

combined heat and electrical power may include one 

megawatt-hour (MW-hr) for each 3.4 million Btus of useful 

heat recovered (MWth-hr), in addition to each MW-hr of 

net electricity produced (MWe-hr). The compliance of such 

engines shall be based on the following equation:

Lbs = Lbs x Electrical Energy Factor (EEF)

MW-hr MWe-hr

Where:

Lbs/MW-hr = The calculated emissions that shall 

comply with the emission standards in 

Table IV
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 11

Lbs/MWe-hr = The short-term engine emission limit 

in pounds per MWe-hr of net electrical 

energy produced, averaged over 15 

minutes. The engine shall comply 

with this limit at all times.

EEF = The annual MWe-hrs of net electrical 

energy produced divided by the sum of

annual MWe-hrs plus annual MWth-hrs 

of useful heat recovered. The engine 

operator shall demonstrate annually 

that the EEF is less than the value 

required for compliance.

(iii) For combined heat and power engines, the short-term 

emission limits in lbs/MWe-hr and the maximum allowed 

annual EEF must be selected by operator and stated on the 

operating permit. 

(iv) Notwithstanding Rule 2001, the requirements of this 

subparagraph shall apply to NOx emissions from new nonemergency engines driving electrical-generators subject to 

Regulation XX (RECLAIM).

(v) This subparagraph does not apply to: engines installed prior 

to February 1, 2008; engines issued a permit to construct 

prior to February 1, 2008 and installed within 12 months of 

the date of the permit to construct; engines for which an 

application is deemed complete by October 1, 2007;

engines installed by an electric utility on Santa Catalina 

Island; engines installed at remote locations without access 

to natural gas and electric power; engines used to supply 

electrical power to ocean-going vessels while at berth, prior 

to January 1, 2014; or landfill or digester gas-fired engines 

that meet the requirements of subparagraph (d)(1)(C).
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 12

(2) Portable Engines:

(A) The operator of any portable engine generator subject to this rule 

shall not use the portable generator for: 

(i) Power production into the electric grid, except to maintain 

grid stability during an emergency event or other 

unforeseen event that affects grid stability; or

(ii) Primary or supplemental power to a building, facility, 

stationary source, or stationary equipment, except during 

unforeseen interruptions of electrical power from the 

serving utility, maintenance and repair operations, and 

remote operations where grid power is unavailable. For 

interruptions of electrical power, the operation of a portable 

generator shall not exceed the time of the actual 

interruption of power. 

This subparagraph shall not apply to a portable generator that 

complies with emission concentration limits of Table I and the 

other requirements in this rule applicable to stationary engines.

(B) The operator of any portable diesel engine shall comply with the 

applicable requirements of the Subchapter 7.5 Airborne Toxic 

Control Measures for diesel particulate matter in Chapter 1, 

Division 3, Title 17 of the California Code of Regulations.

(C) The operator of any portable spark-ignited engine shall comply 

with the applicable requirements of the Large Spark Ignition 

Engine Fleet Requirements, Article 2, Chapter 15, Division 3, 

Title 13 of the California Code of Regulations. 

(e) Compliance

(1) Agricultural Stationary Engines:

(A) The operator of any agricultural stationary engine subject to this 

rule and installed or issued a permit to construct prior to June 3, 

2005 shall comply with subparagraph (d)(1)(B) and the other 

applicable provisions of this rule in accordance with the 

compliance schedules in Table V:
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 13

TABLE V

COMPLIANCE SCHEDULES FOR STATIONARY 

AGRICULTURAL ENGINES

Action Required Tier 2 and Tier 3 Diesel 

Engines, Certified SparkIgnition Engines, and All 

Engines at Facilities with 

Actual Emissions Less 

Than the Amounts in the 

Table of Rule 219(q)

Other Engines

Submit notification of 

applicability to the Executive 

Officer

January 1, 2006 January 1, 2006

Submit to the Executive 

Officer applications for 

permits to construct engine 

modifications, control 

equipment, or replacement 

engines

March 1, 2009 September 1, 2007

Initiate construction of 

engine modifications, control 

equipment, or replacement 

engines

September 30, 2009, or 30 

days after the permit to 

construct is issued, 

whichever is later

March 30, 2008, or 

30 days after the 

permit to construct 

is issued, whichever 

is later

Complete construction and 

comply with applicable 

requirements

January 1, 2010, or 60 days 

after the permit to 

construct is issued, 

whichever is later

July 1, 2008, or 60 

days after the 

permit to construct 

is issued, whichever 

is later

Complete initial source 

testing 

March 1, 2010, or 120 days 

after the permit to 

construct is issued, 

whichever is later

September 1, 2008, 

or 120 days after the 

permit to construct 

is issued, whichever 

is later

The notification of applicability shall include the following for 

each engine:

(i) Name and mailing address of the operator

(ii) Address of the engine location

(iii) Manufacturer, model, serial number, and date of 

manufacture of the engine

(iv) Application number

(v) Engine type (diesel, rich-burn spark-ignition or lean-burn 

spark-ignition)
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 14

(vi) Engine fuel type

(vii) Engine use (pump, compressor, generator, or other)

(viii) Expected means of compliance (engine replacement, 

control equipment installation, or electrification)

(B) The operator of any new agricultural stationary engine that is not 

subject to the compliance schedule of subparagraph (e)(1)(A) for 

existing engines shall comply with the requirements of 

subparagraph (d)(1)(I) immediately upon installation.

(2) Non-Agricultural Stationary Engines:

(A) The operator of any stationary engine not meeting the requirements 

of subparagraphs (d)(1)(B) or (d)(1)(C) that go into effect in 2010 

or later, shall comply with the compliance schedule in Table VI:

TABLE VI

COMPLIANCE SCHEDULE FOR NON

-AGRICULTURAL STATIONARY ENGINES

Action Required

Applicable Compliance

Date

Submit to the Executive 

Officer applications for 

permits to construct engine 

modifications, control 

equipment, or replacement 

engines

Twelve months before the 

final compliance date

Initiate construction of 

engine modifications, control 

equipment, or replacement 

engines

Three months before the 

final compliance date, or

60 days after the permit to 

construct is issued, 

whichever is later

Complete construction and 

comply with applicable 

requirements

The final compliance date, 

or 120 days after the permit 

to construct is issued, 

whichever is later

Complete initial source 

testing 

60 days after the final 

compliance date in 

(d)(1)(B) or (d)(1)(C), or 

180 days after the permit to 

construct is issued, 

whichever is later
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 15

(B) The operator of any stationary engine that elects to amend a permit 

to operate to incorporate ECF-adjusted emission limits shall submit 

to the Executive Officer an application for a change of permit 

conditions by August 1, 2008, and comply with emission limits of 

the previous version of this rule until February 1, 2009 when the 

engine shall be in compliance with the emission limits of this rule.

(C) The operator of any stationary engine that is required to add 

operating restrictions to a permit to operate to meet the 

requirements of this rule shall submit to the Executive Officer an 

application for a change of permit conditions by August 1, 2008.

(3) Stationary Engine CEMS 

(A) The operator of any stationary engine with an existing CEMS shall 

commence the reporting required by Rule 218 Subdivision (f) on 

January 1, 2008. The first summary report for the six months 

ending June 30, 2008 shall be due on July 30, 2008.

(B) The operator of any stationary engine that is required to modify an

existing CEMS or install a CEMS on an existing engine shall 

comply with the compliance schedule in Table VII. Public 

agencies shall be allowed one year more than the dates in 

Table VII, except for biogas engines.

TABLE VII

COMPLIANCE SCHEDULE FOR NEW OR MODIFIED CEMS

ON EXISTING ENGINES

Action Required

Applicable Compliance Dates For:

Non-Biogas 

Engines Rated at 

750 bhp or More

Non-Biogas 

Engines Rated at 

Less than 750 bhp Biogas Engines*

Submit to the Executive 

Officer applications for 

new or modified CEMS

August 1, 2008 August 1, 2009 January 1, 2011

Complete installation 

and commence CEMS 

operation, calibration, 

and reporting 

requirements

Within 180 days of 

initial approval

Within 180 days of 

initial approval

Within 180 days 

of initial 

approval

Complete certification 

tests

Within 90 days of 

installation

Within 90 days of 

installation

Within 90 days 

of installation
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 16

TABLE VII

COMPLIANCE SCHEDULE FOR NEW OR MODIFIED CEMS

ON EXISTING ENGINES

Action Required

Applicable Compliance Dates For:

Non-Biogas 

Engines Rated at 

750 bhp or More

Non-Biogas 

Engines Rated at 

Less than 750 bhp Biogas Engines*

Submit certification 

reports to Executive 

Officer

Within 45 days 

after tests are 

completed

Within 45 days 

after tests are 

completed

Within 45 days 

after tests are 

completed

Obtain final approval of 

CEMS

Within 1 year of 

initial approval

Within 1 year of 

initial approval

Within 1 year of 

initial approval

* A biogas engine is one that is subject to the emission limits of Table III.

(4) Stationary Engine Inspection and Monitoring (I&M) Plans:

The operator of stationary engines subject to the I&M plan provisions of 

subparagraph (f)(1)(D) shall:

(A) By August 1, 2008, submit an initial I&M plan application to the 

Executive Officer for approval;

(B) By December 1, 2008, implement an approved I&M plan or the 

I&M plan as submitted if the plan is not yet approved.

Any operator of 15 or more stationary engines subject to the I&M plan 

provisions shall comply with the above schedule for at least 50% of 

engines, and for the remaining engines shall:

(C) By February 1, 2009, submit an initial I&M plan application to the 

Executive Officer for approval;

(D) By June 1, 2009, implement an approved I&M plan or the I&M 

plan as submitted if the plan is not yet approved.

(5) Stationary Engine Air-to-Fuel Ratio Controllers

(A) The operator of any stationary engine that does not have an air-tofuel ratio controller, as required by subparagraph (d)(1)(J), shall 

comply with those requirements in accordance with the compliance 

schedule in Table V, except that the application due date is no later 

than May 1, 2008 and the initial source testing may be conducted 

at the time of the testing required by subparagraph (f)(1)(C).

(B) The operator of any stationary engine that has the air-to-fuel ratio 

controller required by subparagraph (d)(1)(J), but it is not listed on 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 17

the permit to operate, shall submit to the Executive Officer an 

application to amend the permit by April 1, 2008.

(C) The operator of more than five engines that do not have air-to-fuel 

ratio controllers may take an additional three months, to May 1, 

2009, to install the equipment on up to 50% of the affected 

engines.

(6) New Stationary Engines

The operator of any new stationary engine issued a permit to construct 

after February 1, 2008 shall comply with the applicable I&M or CEMS 

requirements of this rule when operation commences. If applicable, the 

operator shall provide the required information in subparagraph (f)(1)(D) 

to the Executive Officer prior to the issuance of the permit to construct so 

that the I&M procedures can be included in the permit. A separate I&M 

plan application is not required.

(7) Biogas Engines

For any biogas engine for which the operator applies to the Executive 

Officer by April 1, 2008 for a change of permit conditions for ECFcorrected emission limits, or the approval to burn more than 10 percent 

natural gas in accordance with subparagraph (d)(1)(C), the biogas engine 

shall not be subject to the initial concentration limits of Tables II or III

until August 1, 2008, provided the operator continues to comply with all 

emission limits in effect prior to February 1, 2008.

(8) Compliance Schedule Exception

If an engine operator submits to the Executive Officer an application for 

an administrative change of permit conditions to add a permit condition 

that causes the engine permit to expire by the effective date of any 

requirement of this rule, then the operator is not required to comply with

the earlier steps required by this subdivision for that requirement. The 

effective date for the CEMS requirements shall be one year after the date 

that a CEMS application is due.

(9) Exceedance of Usage Limits

(A) If an engine was initially exempt from the new concentration limits 

in subparagraph (d)(1)(B) or subparagraph (d)(1)(C) that take 

effect on or after July 1, 2010 because of low engine use but later 

exceeds the low-use criteria, the operator shall bring the engine 

into compliance with the rule in accordance with the schedule in 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 18

Table VI with the final compliance date in Table VI being twelve 

months after the conclusion of the first twelve-month period for 

which the engine exceeds the low-use criteria.

(B) If engines that were initially exempt from new CEMS by the lowuse criterion in subclause (f)(1)(A)(ii)(I) later exceed that criterion, 

the operator shall install CEMS on those engines in accordance 

with the schedule in Table VII, except that the date for submitting 

the CEMS application in Table VII shall be six months after the 

conclusion of the first twelve-month period for which the engines 

exceed the criterion.

(f) Monitoring, Testing, Recordkeeping and Reporting

(1) Stationary engines:

The operator of any engine subject to the provisions of paragraph (d)(1) of 

this rule shall meet the following requirements:

(A) Continuous Emission Monitoring

(i) For engines of 1000 bhp and greater and operating more 

than two million bhp-hr per calendar year, a NOx and CO

continuous emission monitoring system (CEMS) shall be 

installed, operated and maintained in calibration to 

demonstrate compliance with the emission limits of this 

rule.

(ii) (I) For facilities with engines subject to paragraph 

(d)(1), having a combined rating of 1500 bhp or 

greater at the same location, and having a combined 

fuel usage of more than 16 x 109 Btus per year

(higher heating value), CEMS shall be installed, 

operated and maintained in calibration to 

demonstrate compliance of those engines with the 

applicable NOx and CO emission limits of this rule. 

(II) Any engine that as of October 1, 2007 is located 

within 75 feet of another engine (measured from 

engine block to engine block) is considered to be at 

the same location. Operators of new engines shall 

not install engines farther than 75 feet from another 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 19

engine unless the operator demonstrates to the 

Executive Officer that operational needs or space 

limitations require it.

(III) The following engines shall not be counted toward 

the combined rating or required to have a CEMS by 

this clause: engines rated at less than 500 bhp; 

standby engines that are limited by permit 

conditions to only operate when other primary 

engines are not operable; engines that are limited by 

permit conditions to operate less than 1000 hours 

per year or a fuel usage of less than 8 x 109 Btus per 

year (higher heating value of all fuels used); engines 

that are used primarily to fuel public natural gas 

transit vehicles and that are required by a permit 

condition to be irreversibly removed from service 

by December 31, 2014; and engines required to 

have a CEMS by the previous clause. A CEMS 

shall not be required if permit conditions limit the 

simultaneous use of the engines at the same location 

in a manner to limit the combined rating of all 

engines in simultaneous operation to less than 1500 

bhp. 

(IV) For engines rated below 1000 bhp, the CEMS may 

be time shared by multiple engines. 

(V) Operation of engines by the electric utility in the 

Big Bear Lake area during the failure of a 

transmission line to the utility may be excluded 

from an hours-per-year or fuel usage limit that is 

elected by the operator pursuant to subclause 

(f)(1)(A)(ii)(III).

(VI) In lieu of complying with subclause (f)(1)(A)(ii)(I), 

an operator that is a public agency, or is contracted 

to operate engines solely for a public agency, may 

comply with the Inspection and Monitoring Plan 

requirements of subparagraph (f)(1)(D), except that 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 20

the operator shall conduct emission checks at least 

weekly or every 150 operating hours, whichever 

occurs later. If any such engine is found to exceed 

an applicable NOx or CO limit by a source test 

required by subparagraph (f)(1)(C) or District test 

using a portable analyzer on three or more 

occasions in any 12-month period, the operator shall 

comply with the CEMS requirements of this 

subparagraph for such engine in accordance with 

the compliance schedule of Table VII, except that 

the operator shall submit a CEMS application to the 

Executive Officer within six months of the third 

exceedance.

(iii) All CEMS required by this rule shall:

(I) Comply with the applicable requirements of 

Rule 218, including equipment specifications and 

certification, operating, recordkeeping, quality 

assurance and reporting requirements, except as 

otherwise authorized by this rule;

(II) Include equipment that measures and records 

exhaust gas concentrations, both uncorrected and 

corrected to 15 percent oxygen on a dry basis; and

(III) Have data gathering and retrieval capability 

approved by the Executive Officer

(iv) The operator of an engine that is required to install CEMS 

may request the Executive Officer to approve an alternative 

monitoring device (or system components) to demonstrate 

compliance with the emission limits of this rule. The 

applicant shall demonstrate to the Executive Officer that 

the proposed alternative monitoring device is at a minimum 

equivalent in relative accuracy, precision, reliability, and 

timeliness to a CEMS for that engine, according to the 

criteria specified in 40 CFR Part 75 Subpart E. In lieu of 

the criteria specified in 40 CFR Part 75 Subpart E, 

substitute criteria is acceptable if the applicant 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 21

demonstrates to the Executive Officer that the proposed 

alternative monitoring device is at minimum equivalent in 

relative accuracy, precision, reliability, and timeliness to a 

CEMS for that engine. Upon approval by the Executive 

Officer, the substitute criteria shall be submitted to EPA as 

an amendment to the State Implementation Plan (SIP).

If the alternative monitoring device is denied or fails to be 

recertified, a CEMS shall be required.

(v) Notwithstanding the requirements of Rules 218 and 218.1, 

operators of engines that are required to install a CEMS by 

clause (f)(1)(A)(ii) of this subparagraph may:

(I) Store data electronically without a strip chart 

recorder, but there shall be redundant data storage 

capability for at least 15 days of data. The operator 

must demonstrate that both sets of data are 

equivalent.

(II) Conduct relative accuracy testing on the same 

schedule for source testing in clause (f)(1)(C)(i), 

instead of annually. The minimum sampling time 

for each test is 15 minutes.

(vi) Notwithstanding the requirements of Rules 218 and 218.1, 

operators of engines that are required to install a CEMS by 

clause (ii) of this subparagraph, and that are to be 

monitored by a timeshared CEMS, may:

(I) Monitor an engine with the CEMS for 15 

consecutive minutes, purge for the minimum 

required purge time, then monitor the next engine 

for 15 consecutive minutes. The CEMS shall 

operate continuously in this manner, except for 

required calibrations.

(II) Record the corrected and uncorrected NOx, CO and 

diluent data at least once per minute and calculate 

and record the 15-minute average corrected 

concentrations for each sampling period. 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 22

(III) Have sample lines to each engine that are not the 

same length. The purge time will be based on the 

sample line with the longest response time. 

Response times shall be checked during cylinder 

gas audits. Sample lines shall not exceed 100 feet 

in length.

(IV) Conduct a minimum of five tests for each engine 

during relative accuracy tests. 

(V) Perform a cylinder gas audit every calendar quarter 

on each engine, except for engines for which 

relative accuracy testing was conducted that quarter. 

(VI) Exclude monitoring of nitrogen dioxide (NO2) for 

rich-burn engines, unless source testing 

demonstrates that NO2 is more than 10 percent of 

total NOx.

(VII) Conduct daily calibration error (CE) tests by 

injecting calibration gases at the analyzers, except 

that at least once per week the CE test shall be 

conducted by injecting calibration gases as close to 

the probe tip as practical. 

(VIII) Stop operating and calibrating the CEMs during any 

period that the operator has a continuous record that 

the engine was not in operation. 

(vii) A CO CEMS shall not be required for lean-burn engines or 

an engine that is subject to Regulation XX (RECLAIM), 

and not required to have a NOx CEMS by that regulation. 

(viii) Notwithstanding the requirements of this paragraph and 

paragraph (c)(2) of Rule 2012, an operator may take an 

existing NOx CEMS out of service for up to two weeks 

(cumulative) in order to modify the CEMS to add CO 

monitoring.

(B) Elapsed Time Meter

Maintain an operational non-resettable totalizing time meter to 

determine the engine elapsed operating time.
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 23

(C) Source Testing

(i) Effective August 1, 2008, conduct source testing for NOx, 

VOC reported as carbon, and CO concentrations 

(concentrations in ppm by volume, corrected to 15 percent 

oxygen on dry basis) at least once every two years, or every 

8,760 operating hours, whichever occurs first. Relative 

accuracy tests required by Rule 218.1 or 40 CFR Part 75 

Subpart E will satisfy this requirement for those pollutants 

monitored by a CEMS. The source test frequency may be 

reduced to once every three years if the engine has operated 

less than 2,000 hours since the last source test. If the 

engine has not been operated within three months of the 

date a source test is required, the source test shall be 

conducted when the engine resumes operation for a period 

longer than either seven consecutive days or 15 cumulative 

days of operation. The operator of the engine shall keep 

sufficient operating records to demonstrate that it meets the 

requirements for extension of the source testing deadlines.

(ii) Conduct source testing for at least 30 minutes during 

normal operation (actual duty cycle). This test shall not be 

conducted under a steady-state condition unless it is the 

normal operation. In addition, conduct source testing for 

NOx and CO emissions for at least 15 minutes at: an 

engine’s actual peak load, or the maximum load that can be 

practically achieved during the test, and; at actual minimum 

load, excluding idle, or the minimum load that can be 

practically achieved during the test. These additional two 

tests are not required if the permit limits the engine to 

operating at one defined load, ± 10%. No pre-tests for 

compliance are permitted. The emission test shall be 

conducted at least 40 operating hours, or at least 1 week, 

after any engine servicing or tuning. If an emission 

exceedance is found during any of the three phases of the 

test, that phase shall be completed and reported. The 

operator shall correct the exceedance, and the source test 

may be immediately resumed. 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 24

(iii) Use a contractor to conduct the source testing that is 

approved by the Executive Officer under the Laboratory 

Approval Program for the necessary test methods. 

(iv) Submit a source test protocol to the Executive Officer for 

written approval at least 60 days before the scheduled date 

of the test. The source test protocol shall include the name, 

address and phone number of the engine operator and a 

District-approved source testing contractor that will 

conduct the test, the application and permit number(s),

emission limits, a description of the engine(s) to be tested, 

the test methods and procedures to be used, the number of 

tests to be conducted and under what loads, the required 

minimum sampling time for the VOC test, based on the 

analytical detection limit and expected VOC levels, and a 

description of the parameters to be measured in accordance 

with the I&M plan required by subparagraph (f)(1)(D). 

The source test protocol shall be approved by the Executive 

Officer prior to any testing. The operator is not required to 

submit a protocol for approval if: there is a previously 

approved protocol that meets these requirements; the 

engine has not been altered in a manner that requires a 

permit alteration; and emission limits have not changed

since the previous test. If the operator submits the protocol 

by the required date, and the Executive Officer takes longer 

than 60 days to approve the protocol, the operator shall be 

allowed the additional time needed to conduct the test.

(v) Provide the Executive Officer at least 30 days prior notice 

of any source test to afford the Executive Officer the 

opportunity to have an observer present. If after 30 days 

notice for an initially scheduled performance test, there is a 

delay (due to operational problems, etc.) in conducting the 

scheduled performance test, the engine operator shall notify 

the Executive Officer as soon as possible of any delay in 

the original test date, either by providing at least seven days 

prior notice of the rescheduled date of the performance test, 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 25

or by arranging a rescheduled date with the Executive 

Officer by mutual agreement.

(vi) Submit all source test reports, including a description of the 

equipment tested, to the Executive Officer within 60 days 

of completion of the test.

(vii) By February 1, 2009, provide, or cause to be provided, 

source testing facilities as follows:

(I) Sampling ports adequate for the applicable test 

methods. This includes constructing the air 

pollution control system and stack or duct such that 

pollutant concentrations can be accurately 

determined by applicable test methods;

(II) Safe sampling platform(s), scaffolding or 

mechanical lifts, including safe access, that comply 

with California General Safety Orders. Agricultural 

stationary engines are excused from this subclause 

if they are in remote locations without electrical 

power;

(III) Utilities for sampling and testing equipment. 

Agricultural stationary engines are exempt from this 

subclause if they are on wheels and moved to 

storage during the off season.

(D) Inspection and Monitoring (I&M) Plan

Submit to the Executive Officer for written approval and 

implement an I&M plan. One plan application is required for each 

facility. The I&M plan shall include:

(i) Identification of engine and control equipment operating 

parameters necessary to maintain pollutant concentrations 

within the rule and permit limits. This shall include, but 

not be limited to:

(I) Procedures for using a portable NOx, CO and 

oxygen analyzer to establish the set points of the 

air-to-fuel ratio controller (AFRC) at 25%, 60% and 

95% load (or fuel flow rate), ± 5%, or the 

minimum, midpoint and maximum loads that 

actually occur during normal operation, ± 5%, or at 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 26

any one load within the ± 10% range that an engine 

permit is limited to in accordance with clause 

(f)(1)(C)(ii);

(II) Procedures for verifying that the AFRC is 

controlling the engine to the set point during the 

daily monitoring required by clause (f)(1)(D)(iv); 

(III) Procedures for reestablishing all AFRC set points 

with a portable NOx, CO and oxygen analyzer 

whenever a set point must be readjusted, within 24 

hours of an oxygen sensor replacement, and, for 

rich-burn engines with three way catalysts, between 

100 and 150 engine operating hours after an oxygen 

sensor replacement;

(IV) For engines with catalysts, the maximum allowed 

exhaust temperature at the catalyst inlet, based on 

catalyst manufacturer specifications;

(V) For lean-burn engines with selective catalytic 

control devices, the minimum exhaust temperature 

at the catalyst inlet required for reactant flow 

(ammonia or urea), and procedures for using a 

portable NOx and oxygen analyzer to establish the 

acceptable range of reactant flow rate, as a function 

of load.

Parameter monitoring is not required for diesel engines 

without exhaust gas recirculation and catalytic exhaust 

control devices.

(ii) Procedures for alerting the operator to emission control 

malfunctions. Engine control systems, such as air-to-fuel 

ratio controllers, shall have a malfunction indicator light 

and audible alarm. 

(iii) Procedures for at least weekly or every 150 engine 

operating hours, whichever occurs later, emissions checks 

by a portable NOx, CO and oxygen analyzer. 

(I) If an engine is in compliance for three consecutive 

emission checks, without any adjustments to the 

oxygen sensor set points, then the engine may be 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 27

checked monthly or every 750 engine operating 

hours, whichever occurs later, until there is a 

noncompliant emission check or, for rich-burn 

engines with three-way catalysts, the oxygen sensor 

is replaced. When making adjustments to the 

oxygen sensor set points, returning to a more 

frequent emission check schedule is not required if 

the engine is in compliance with the applicable 

emission limits prior to and after the set point 

adjustments, notwithstanding the requirements of 

(f)(1)(D)(iii)(IV). 

(II) For diesel engines and other lean-burn engines that 

are subject to Regulation XX or have a NOx CEMs, 

and that are subject to a CO limit more stringent 

than the 2000 ppmvd limit of Tables II or III, a CO 

emission check shall be performed at least 

quarterly, or every 2,000 engine operating hours, 

whichever occurs later. 

(III) For diesel engines and other lean-burn engines that 

are subject to Regulation XX or have a NOx CEMs, 

and that are not subject to a CO limit more stringent 

than the 2000 ppmvd limit of Tables II or III, 

emission checks are not required.

(IV) No engine or control system maintenance or tuning 

may be conducted within 72 hours prior to the 

emission check, unless it is an unscheduled, 

required repair.

(V) The portable analyzer shall be calibrated, 

maintained and operated in accordance with the 

manufacturer’s specifications and recommendations 

and the Protocol for the Periodic Monitoring of 

Nitrogen Oxides, Carbon Monoxide, and Oxygen 

from Stationary Engines Subject to South Coast Air 

Quality Management District Rule 1110.2, 

approved on February 1, 2008, or subsequent 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 28

protocol approved by EPA and the Executive 

Officer.

(iv) Procedures for at least daily monitoring, inspection and 

recordkeeping of:

(I) engine load or fuel flow rate;

(II) the set points, maximums and acceptable ranges of 

the parameters identified by clause (f)(1)(D)(i), and 

the actual values of the same parameters;

(III) the engine elapsed time meter operating hours;

(IV) the operating hours since the last emission check 

required by clause (f)(1)(D)(iii);

(V) for rich-burn engines with three-way catalysts, the 

difference of the exhaust temperatures (ΔT) at the 

inlet and outlet of the catalyst (changes in the ΔT

can indicate changes in the effectiveness of the 

catalyst);

(VI) engine control system and AFRC system faults or 

alarms that affect emissions.

The daily monitoring and recordkeeping may be done in 

person by the operator, or by remote monitoring. 

(v) Procedures for responding to, diagnosing and correcting 

breakdowns, faults, malfunctions, alarms, emission checks 

finding emissions in excess of rule or permit limits, and 

parameters out-of-range. 

(I) For a breakdown resulting in a violation of this rule 

or a permit condition, or for an emission check that 

finds emissions in excess of those allowed by this 

rule or a permit condition, the operator shall correct 

the problem and demonstrate compliance with 

another emission check, or shut down an engine by 

the end of an operating cycle, or within 24 hours 

from the time the operator knew of the breakdown 

or excess emissions, or reasonably should have 

known, whichever is sooner. 

(II) For other problems, such as parameters out-ofrange, an operator shall correct the problem and 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 29

demonstrate compliance with another emission 

check within 48 hours of the operator first knowing 

of the problem.

(III) An operator shall not be considered in violation of 

the emission limits of this rule or in permit 

conditions if the operator complies with this 

subparagraph and the reporting requirements of 

subparagraph (f)(1)(H). Any emission check 

conducted by District staff that finds excess 

emissions is a violation. 

(vi) Procedures and schedules for preventive and corrective 

maintenance.

(vii) Procedures for reporting noncompliance to the Executive 

Officer in accordance with subparagraph (f)(1)(H).

(viii) Procedures and format for the recordkeeping of monitoring 

and other actions required by the plan.

(ix) Procedures for plan revisions. Before any change in I&M 

plan operations can be implemented, the revised I&M plan 

shall be submitted to and approved by the Executive 

Officer. The operator shall apply for a plan revision prior 

to any change in emission limits or control equipment.

(x) An engine is not subject to this subparagraph if it is 

required by this rule to have a NOx and CO CEMS, or 

voluntarily has a NOx and CO CEMS that complies with 

this rule.

(E) Operating Log

Maintain a monthly engine operating log that includes:

(i) Total hours of operation;

(ii) Type of liquid and/or type of gaseous fuel;

(iii) Fuel consumption (cubic feet of gas and gallons of liquid); 

and

(iv) Cumulative hours of operation since the last source test 

required in subparagraph (f)(1)(C).

Facilities subject to Regulation XX may maintain a quarterly log 

for engines that are designated as a process unit on the facility 

permit.
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 30

(F) New Non-Emergency Electrical Generating Engines

Operators of engines subject to the requirements of subparagraph 

(d)(1)(K) shall also meet the following requirements.

(i) The engine generator shall be monitored with a calibrated

electric meter that measures the net electrical output of the 

engine generator system, which is the difference between 

the electrical output of the generator and the electricity 

consumed by the auxiliary equipment necessary to operate 

the engine generator. 

(ii) For engines monitored with a CEMS, the emissions of the 

monitored pollutants in ppmvd corrected to 15% O2, lbs/hr, 

and lbs/MWe-hr and the net MWe-hrs produced shall be 

calculated and recorded for the four 15-minute periods of 

each hour of operation. The mass emissions of NOx shall

be calculated based on the measured fuel flow and one of 

the F factor methods of 40 CFR 60, Appendix A, Method 

19, or other method approved by the Executive Officer. 

Mass emissions of CO shall be calculated in the same 

manner as NOx, except that the ppmvd CO shall be 

converted to lb/scf using a conversion factor of 0.727 x 

10-7. 

(iii) For NOx and CO emissions from engines not monitored 

with a CEMS and VOC emissions from all engines, the 

emissions of NOx, CO and VOC in lbs/MWe-hr shall be 

calculated and recorded whenever the pollutant is measured 

by a source test or emission check. Mass emissions of NOx 

and CO shall be calculated in the same manner as the 

previous clause. Mass emissions of VOC shall be 

calculated in the same manner, except that the ppmvd VOC 

as carbon shall be converted to lb/scf using a conversion 

factor of 0.415 x 10-7.

(iv) For engines generating combined heat and power that rely 

on the EEF to comply with Table IV emission standards, 

the daily and annual useful heat recovered (MWth-hrs), net 

electrical energy generated (MWe-hrs) and EEF shall be 

monitored and recorded.
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 31

(v) Other methods of calculating mass emissions than those 

specified, such as by direct measurement of exhaust 

volume, may be used if approved by the Executive Officer. 

All monitoring, calculation, and recordkeeping procedures 

must be approved by the Executive Officer. 

(vi) Operators of combined heat and power engines shall submit 

to the Executive Officer the reports of the following 

information within 15 days of the end of the first year of 

operation, and thereafter within 15 days of the end of each 

calendar year: the annual net electrical energy generated 

(MWe-hrs); the annual useful heat recovered (MWth-hrs), 

the annual EEF calculated in accordance with clause 

(d)(1)(K)(ii); and the maximum annual EEF allowed by the 

operating permit. If the actual annual EEF exceeds the 

allowed EEF, the report shall also include the time periods 

and emissions for all instances where emissions exceeded 

any emission standard in Table IV.

(G) Portable Analyzer Operator Training

The portable analyzer tests required by the I&M Plan requirements 

of subparagraph (f)(1)(D) shall only be conducted by a person who 

has completed an appropriate District-approved training program 

in the operation of portable analyzers and has received a 

certification issued by the District.

(H) Reporting Requirements

(i) The operator shall report to the Executive Officer, by 

telephone (1-800-CUT-SMOG or 1-800-288-7664) or other 

District-approved method, any breakdown resulting in 

emissions in excess of rule or permit emission limits within 

one hour of such noncompliance or within one hour of the 

time the operator knew or reasonably should have known 

of its occurrence. Such report shall identify the time, 

specific location, equipment involved, responsible party to 

contact for further information, and to the extent known, 

the causes of the noncompliance, and the estimated time for 

repairs. In the case of emergencies that prevent a person 

from reporting all required information within the one-hour 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 32

limit, the Executive Officer may extend the time for the 

reporting of required information provided the operator has 

notified the Executive Officer of the noncompliance within 

the one-hour limit.

(ii) Within seven calendar days after the reported breakdown 

has been corrected, but no later than thirty calendar days 

from the initial date of the breakdown, unless an extension 

has been approved in writing by the Executive Officer, the 

operator shall submit a written breakdown report to the 

Executive Officer which includes:

(I) An identification of the equipment involved in 

causing, or suspected of having caused, or having 

been affected by the breakdown;

(II) The duration of the breakdown;

(III) The date of correction and information 

demonstrating that compliance is achieved;

(IV) An identification of the types of excess emissions, if 

any, resulting from the breakdown;

(V) A quantification of the excess emissions, if any, 

resulting from the breakdown and the basis used to 

quantify the emissions;

(VI) Information substantiating whether the breakdown 

resulted from operator error, neglect or improper 

operation or maintenance procedures;

(VII) Information substantiating that steps were 

immediately taken to correct the condition causing 

the breakdown, and to minimize the emissions, if 

any, resulting from the breakdown;

(VIII) A description of the corrective measures undertaken 

and/or to be undertaken to avoid such a breakdown 

in the future; and

(IX) Pictures of any equipment which failed, if available.

(iii) Within 15 days of the end of each calendar quarter, the 

operator shall submit to the Executive Officer a report that 

lists each occurrence of a breakdown, fault, malfunction, 

alarm, engine or control system operating parameter out of 
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 33

the acceptable range established by an I&M plan or permit 

condition, or an emission check that finds excess emissions. 

Such report shall be in a District-approved format, and for 

each incident shall identify the time of the incident, the 

time the operator learned of the incident, specific location, 

equipment involved, responsible party to contact for further 

information, to the extent known the causes of the event, 

the time and description of corrective actions, including 

shutting an engine down, and the results of all portable 

analyzer NOx and CO emissions checks done before or 

after the corrective actions. The operator shall also report 

if no incidents occurred. 

(2) Portable engines:

The operator of any portable engine shall maintain a monthly engine 

operating log that includes:

(i) Total hours of operation; or

(ii) Type of liquid and/or type of gaseous fuel; and

(iii) Fuel consumption (cubic feet of gas and gallons of liquid).

Facilities subject to Regulation XX may maintain a quarterly log for 

engines that are designated as a process unit on the facility permit.

(3) Recordkeeping for All Engines

All data, logs, test reports and other information required by this rule shall 

be maintained for at least five years and made available for inspection by 

the Executive Officer.

(g) Test Methods

Testing to verify compliance with the applicable requirements shall be conducted 

in accordance with the test methods specified in Table VIII, or any test methods 

approved by CARB and EPA, and authorized by the Executive Officer.

TABLE VIII

TESTING METHODS

Pollutant Method

NOx District Method 100.1

CO District Method 100.1
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 34

TABLE VIII

TESTING METHODS

Pollutant Method

VOC District Method 25.1* or District Method 25.3*

* Excluding ethane and methane

A violation of any standard of this rule established by any of the specified test 

methods, or any test methods approved by the CARB or EPA, and authorized by 

the Executive Officer, shall constitute a violation of this rule.

(h) Alternate Compliance Option

(1) In lieu of complying with the applicable emission limits by the effective 

date specified in Table III-B, owners or operators of biogas-fired units that 

operate under long term fixed price power purchase agreements that have 

been entered into prior to February 1, 2008 and extend beyond January 1, 

2016 may elect to defer compliance by up to two years and no later than 

January 1, 2018, provided the owner or operator: 

(A) Submits an alternate compliance plan and pays a Compliance 

Flexibility Fee, as provided for in paragraph (h)(2), to the 

Executive Officer at least 150 days prior to the applicable 

compliance date in Table III-B, and

(B) Maintains on-site a copy of verification of Compliance Flexibility 

Fee payment and AQMD approval of the alternate compliance plan 

that shall be made available upon request to AQMD staff. 

(2) Plan Submittal

The alternate compliance plan submitted pursuant to paragraph (h)(1) shall 

include:

(A) A completed AQMD Form 400A with company name, AQMD 

Facility ID, identification that application is for a compliance plan 

(Section 7a of form), and identification that request is for Rule 

1110.2 Compliance Flexibility Fee option (Section 9 of form);

(B) Attached documentation of unit permit ID, unit rated brake 

horsepower (bhp), and fee calculation;

(C) Proof that the power purchase agreement was entered into prior to 

February 1, 2008 and extends beyond January 1, 2016.

(D) Filing Fee payment; and
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 35

(E) Compliance Flexibility Fee payment as calculated by the following 

equation:

CFF = bhp x R x Y

Where,

CFF = Compliance Flexibility Fee, $

bhp = rated brake horsepower of unit

R = Fee Rate = $47 per brake horsepower per year

Y = Number of years (up to 2 years for engines required to comply 

by January 1, 2016)

(3) Usage of Compliance Flexibility Fee funds

The funds collected from the Compliance Flexibility Fee will be applied to 

AQMD NOx reduction programs pursuant to protocols approved under 

District rules. 

(i) Exemptions

The provisions of subdivision (d) shall not apply to:

(1) All orchard wind machines powered by an internal combustion engine.

(2) Emergency standby engines, engines used for fire-fighting and flood 

control, and any other emergency engines approved by the Executive 

Officer, which have permit conditions that limit operation to 200 hours or 

less per year as determined by an elapsed operating time meter, and 

agricultural emergency standby engines that are exempt from a District 

permit and operate 200 hours or less per year as determined by an elapsed 

operating time meter.

(3) Laboratory engines used in research and testing purposes.

(4) Engines operated for purposes of performance verification and testing of 

engines.

(5) Auxiliary engines used to power other engines or gas turbines during startups.

(6) Portable engines that are registered under the state registration program 

pursuant to Title 13, Article 5 of the CCR.

(7) Nonroad engines, with the exception that subparagraph (d)(2)(A) shall 

apply to portable generators.
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 36

(8) Engines operating on San Clemente Island; and engines operated by the 

County of Riverside for the purpose of public safety communication at 

Santa Rosa Peak in Riverside County, where the site is located at an 

elevation of higher than 7,400 feet above sea level and is without access 

to electric power and natural gas.

(9) Agricultural stationary engines provided that:

(A) The operator submits documentation to the Executive Officer by 

the applicable date in Table V when permit applications are due 

that the applicable electric utility has rejected an application for an 

electrical line extension to the location of the engines, or the 

Executive Officer determines that the operator does not qualify, 

due to no fault of the operator, for funding authorized by California 

Health and Safety Code Section 44229; and

(B) The operator replaces the engines, in accordance with the 

compliance schedule of Table IX, with engines certified by CARB 

to meet the Tier 4 emission standards of 40 CFR Part 1039 

Section 1039.101, Table 1. These Tier 4 replacement engines shall

be considered to comply with Best Available Control Technology; 

and

(C) The operator does not operate the Tier 4 engines in a manner that 

exceeds the not-to-exceed standards of 40 CFR Section 1039.101, 

Paragraph (e), as determined by the test methods of subdivision (g) 

of this rule. 

TABLE IX

COMPLIANCE SCHEDULE FOR INSTALLATION OF NEW 

TIER 4 STATIONARY AGRICULTURAL ENGINES

Action Required Due Date

Submit to the Executive Officer 

applications for permits to 

construct engine modifications, 

control equipment, or 

replacement engines

March 1, 2013

Initiate construction of engine 

modifications, control equipment, 

or replacement engines

September 30, 2013, or 30 days after the 

permit to construct is issued, whichever 

is later
Rule 1110.2 (Cont.) (Amended September 7, 2012)

1110.2 - 37

TABLE IX

COMPLIANCE SCHEDULE FOR INSTALLATION OF NEW 

TIER 4 STATIONARY AGRICULTURAL ENGINES

Action Required Due Date

Complete construction and 

comply with applicable 

requirements

January 1, 2014, or 60 days after the 

permit to construct is issued, whichever 

is later

Complete initial source testing March 1, 2014, or 120 days after the 

permit to construct is issued, whichever 

is later

(10) An engine start-up, until sufficient operating temperatures are reached for 

proper operation of the emission control equipment, and an engine 

shutdown period. The periods shall not exceed 30 minutes, unless the 

Executive Officer approves a longer period not exceeding 2 hours for an 

engine and makes it a condition of the engine permit.

(11) An engine start-up, after an engine overhaul or major repair requiring 

removal of a cylinder head, for a period not to exceed four operating 

hours.

(12) The initial commissioning of a new engine for a period specified by permit 

conditions, provided the operator takes measures to reduce emissions and 

the duration of the commissioning to the extent possible. The 

commissioning period shall not exceed 150 operating hours.